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Right now I'm stuck with nVidia's Jetson line of products which is vendor-locked to Ubuntu. The problem is that while you can extend them with a large SSD drive, these products have a really small disk used for /. I could run another OS inside a Docker container, all to avoid this limitation in snap, but of course things will not become prettier.

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You've been able to run the root on (nvme) SSD for a while now with Dusty's scripts, and more recently with the official installer.

I have great sympathy though, I am also using Ubuntu on Jetson and resent snap, especially since the new releases are 20.04 which have it more tightly integrated.

You can change the root parameter in extlinux.conf to point to whatever block storage you want it to

Or reconfigure U-Boot to load extlinux.conf (and the kernel image, initrd, etc) entirely from other type of media. IIRC NVMe, USB and external SDs are all supported

Thanks, I'll have to look into it.

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